This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 18 |
| 4 | 126 |
| 5 | 990 |
| 6 | 850 |
| 7 | 11970 |
| 8 | 19530 |
| 9 | 25830 |
| 10 | 4606 |
| 11 | 73458 |
| 12 | 92862 |
| 13 | 116298 |
| 14 | 43134 |
| 15 | 229086 |
| 16 | 275418 |
| 17 | 366894 |
| 18 | 440946 |
| 19 | 515394 |
| 20 | 568062 |
| 21 | 613206 |
| 22 | 769158 |
| 23 | 963378 |
| 24 | 1060254 |
| 25 | 1135602 |
| 26 | 6108570 |
| 27 | 6431490 |
| 28 | 6915870 |
| 29 | 8923590 |
| 30 | 9398610 |
| 31 | 10191870 |
| 32 | 11352510 |
| 33 | 3139866 |
| 34 | 16458210 |